An energy functional for Lagrangian tori in $$\mathbb {C}P^2$$ |
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Authors: | Hui Ma Andrey E Mironov Dafeng Zuo |
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Institution: | 1.Department of Mathematical Sciences,Tsinghua University,Beijing,People’s Republic of China;2.Sobolev Institute of Mathematics,Novosibirsk,Russia;3.Novosibirsk State University,Novosibirsk,Russia;4.School of Mathematical Science,University of Science and Technology of China,Hefei,People’s Republic of China;5.Wu Wen-Tsun Key Laboratory of Mathematics, USTC,Chinese Academy of Sciences,Hefei,People’s Republic of China |
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Abstract: | A two-dimensional periodic Schrödingier operator is associated with every Lagrangian torus in the complex projective plane \({\mathbb C}P^2\). Using this operator, we introduce an energy functional on the set of Lagrangian tori. It turns out this energy functional coincides with the Willmore functional \(W^{-}\) introduced by Montiel and Urbano. We study the energy functional on a family of Hamiltonian-minimal Lagrangian tori and support the Montiel–Urbano conjecture that the minimum of the functional is achieved by the Clifford torus. We also study deformations of minimal Lagrangian tori and show that if a deformation preserves the conformal type of the torus, then it also preserves the area, i.e., preserves the value of the energy functional. In particular, the deformations generated by Novikov–Veselov equations preserve the area of minimal Lagrangian tori. |
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